The Louisville and Nashville Railroad (reporting mark LN), commonly called the L&N, was a Class I railroad that operated freight and passenger services in the southeast United States.

Chartered by the Commonwealth of Kentucky in 1850, the road grew into one of the great success stories of American business. Operating under one name continuously for 132 years, it survived civil war and economic depression and several waves of social and technological change. Under Milton H. Smith, president of the company for thirty years, the L&N grew from a road with less than three hundred miles (480 km) of track to a 6,000-mile (9,700 km) system serving thirteen states. As one of the premier Southern railroads, the L&N extended its reach far beyond its namesake cities, stretching to St. Louis, Memphis, Atlanta, and New Orleans. The railroad was economically strong throughout its lifetime, operating both freight and passenger trains in a manner that earned it the nickname, "The Old Reliable."

Growth of the railroad continued until its purchase and the tumultuous rail consolidations of the 1980s which led to continual successors. By the end of 1970, L&N operated 6,063 miles (9,757 km) of road on 10,051 miles (16,176 km) of track, not including the Carrollton Railroad.

In 1971 the Seaboard Coast Line Railroad, successor to the Atlantic Coast Line Railroad, purchased the remainder of the L&N shares it did not already own, and the company became a subsidiary. By 1982 the railroad industry was consolidating quickly, and the Seaboard Coast Line absorbed the Louisville & Nashville Railroad entirely. Then in 1986, the Seaboard System merged with the C&O and B&O and the new combined system was known as the Chessie System. Soon after the combined company became CSX Transportation (CSX), which now owns and operates all of the former Louisville and Nashville lines.

Founded in Philadelphia, Pennsylvania, the home of its North American headquarters, Bachmann is today part of the Kader group, who model products are made at a Chinese Government joint-venture plant in Dongguan, China. Bachmann's brand is the largest seller, in terms of volume, of model trains in the world. Bachmann primarily specializes in entry level train sets, and premium offerings in many scales. The Spectrum line is the high quality, model railroad product line, offered in N, HO, Large Scale, On30, and Williams O gauge all aimed for the hobbyist market. Bachmann is the producer of the famous railroad village product line known as "Plasticville." The turnover for Bachmann model trains for the year ended 31 December 2006 was approximately $46.87 million, a slight increase of 3.36% as compared to 2005.